Many operations do not pass refs to Write. Similarly adding

...interface{} requires constructing a slice, which is slow.

This cuts about 100ns from RRect and Border benchmark.

Signed-off-by: Egon Elbre <egonelbre@gmail.com>

io/key/key.go

@@ -113,7 +113,7 @@ func (m Modifiers) Contain(m2 Modifiers) bool {
 }
 
 func (h InputOp) Add(o *op.Ops) {
-	data := o.Write(opconst.TypeKeyInputLen, h.Tag)
+	data := o.Write1(opconst.TypeKeyInputLen, h.Tag)
 	data[0] = byte(opconst.TypeKeyInput)
 	if h.Focus {
 		data[1] = 1